Perimeter Blueprints Guided Notes
Perimeter Blueprints
Architect's Guide to Boundary Measurement
Name:
Date:
Key Concept: What is Perimeter?
The perimeter is the total distance around the outside of a shape.
Architect's Rule:
"To find the perimeter, add up all the side lengths!"
Example 1: Standard Polygon
8 cm 7 cm 6 cm 7 cm
Calculation:
8 + 7 + 6 + 7 = ______
Perimeter = ______ cm
Example 2: Unknown Side Lengths Total Perimeter = 24 inches
9 in 3 in 9 in ?
The Strategy:
- Add known sides: 9 + 3 + 9 = ___
- Subtract from total: 24 - ___ = ___
- Side Length = ______ in
Field Practice
1. Find Perimeter:
10 ft 10 ft 12 ft
Architect's Workspace:
Perimeter = ___________
2. Missing Side:
P = 20 meters
5 m 5 m 5 m ?
Architect's Workspace:
Side Length = ___________
3. Find Perimeter:
10 in 6 in 8 in 7 in 4 in
Architect's Workspace:
Perimeter = ___________
Boundary Builders Worksheet
Boundary Builders Worksheet
Project: Polygon Perimeter Calculations
Name:
Date:
Contractor's Instructions:
Solve each problem below. Show your addition or subtraction steps clearly in the workspace. Include units in your final answer.
1. Find the perimeter:
12 cm 5 cm
Answer: ____________
2. Find the perimeter:
8 in 8 in 10 in
Answer: ____________
3. Find the perimeter:
15 ft 10 ft 7 ft 4 ft 8 ft 4 ft
Answer: ____________
4. Missing side (?):
P = 30 m
10 m 8 m 6 m ?
Answer: ____________
5. Square Sandbox:
A square sandbox has a perimeter of 32 feet. What is the length of one side?
Answer: ____________
6. Rectangular Missing Side:
P = 20 yd
7 yd ?
Answer: ____________
7. Garden Layout:
Mr. Miller is building a fence around his rectangular garden. The length is 15 meters and the width is 9 meters. How much fencing does he need in total?
Total Fencing: ________________
8. Pentagon Path:
A regular pentagon has five equal sides. If one side is 6 inches long, what is the perimeter?
Answer: ____________
9. Missing Dimensions:
P = 28 feet
10 ft ? 10 ft ?
Answer: ____________
10. Architect's Challenge:
A blueprint for a building shows a shape with 6 sides. Three of the sides are 4 cm long each. The other three sides are 6 cm long each. What is the total perimeter of the building?
Total Perimeter: ________________
Perimeter Solution Key Teacher Guide
Solution Key Teacher Guide
Lesson: Perimeter Precision (NC.3.MD.8)
Guided Notes Answer Key
Example 1: Standard Polygon
8 + 7 + 6 + 7 = 28 cm
Example 2: Unknown Side
9+3+9 = 21; 24-21 = 3 in
Worksheet Solutions
1. 34 cm
12 + 5 + 12 + 5
2. 26 in
8 + 8 + 10
3. 48 ft
15+10+7+4+8+4
4. 6 m
30 - (10+8+6) = 30-24
5. 8 ft
32 ÷ 4 = 8
6. 3 yd
20-14=6; 6÷2=3
7. 48 m
15+15+9+9
8. 30 in
5 x 6 = 30
9. 4 ft
28-20=8; 8÷2=4
10. 30 cm
(4x3) + (6x3) = 12+18
Pedagogy & EOG Rigor
Concept Check
Ensure students understand that rectangles have two pairs of equal sides. In Problems 1, 6, 7, and 9, labeling only one length/width is a common distractor.
Common Error
Students often forget to subtract from the total perimeter in missing side problems, giving the sum of the known sides as the answer instead.
